Welcome to ReefCentral.
Because of the sheer size of our forum, we've been forced to limit selling and trading to members who've met a couple of criteria. (If you're seeing this message, you haven't met them yet.) Please take a moment to acquaint yourself with our selling/trading rules to help make your stay a long and rewarding one.
Selling and trading on ReefCentral.

I'm cycling now a new tank with aquaforest bio s... now ammonia is around 2ppm .. nitrite is 2ppm and nitrate is around 20ppm.....
This is my question:
When I have to begin with Pro bio S and Np Pro.??